[ad_1]
I’ve an late 2014 iMac 27 5k that has a black sleep display challenge.
I received it refurbished, it arrived with BigSur put in, the display would go black each time sure movies the place been performed (particularly in safari browser)
I re-installed the unique system that got here with the late 2014 iMac (Mac OS X 10.10 (14A389) Yosemite) however as a result of its as ineffective to even browse the online I went straight to testing Mojave, Catalina and BigSur aka BigBrotha, all which had black screens throughout video playback or a number of graphic pictures open.
My assessments included reboots into Apple diagnostics and utilizing Etrecheck, all which indicated NO PROBLEM in addition to reset SMC, pram and so forth but the black display endured.
The one occasions during which the black display by no means occurs is in protected mode or rebooting with the ability button down earlier than connecting the cable which leads to a loud blasted fan within the background, so the display works and I consider its some driver-extension.
Can anybody right here advise on what I can do to isolate this points and resolve it?
Cheers
[ad_2]
